('ebuild', '/', 'net-libs/ortp-0.13.1-r1', 'merge') pulled in by net-libs/ortp:0 required by world

It may be possible to solve this problem by using package.mask toprevent one of those packages from being selected. However, it is alsopossible that conflicting dependencies exist such that they areimpossible to satisfy simultaneously. If such a conflict exists in thedependencies of two different packages, then those packages can not beinstalled simultaneously.

For more information, see MASKED PACKAGES section in the emerge man pageor refer to the Gentoo Handbook.

!!! Problems have been detected with your world file!!! Please run emaint --check world

emerge: there are no ebuilds built with USE flags to satisfy "~app-text/poppler-bindings-0.10.5[qt3]".!!! One of the following packages is required to complete your request:- app-text/poppler-bindings-0.10.5 (Change USE: +qt3)(dependency required by "kde-base/kpdf-3.5.10" [ebuild])(dependency required by "world" [argument])

You look like you are using a relatively old version of Sabayon Linux (I could be wrong, but I'm guessing by the errors with a 2.6.26 kernel). Older versions often are more difficult to upgrade, but not impossible.

At any rate, these are all common portage problems. There are many threads dealing with these kind of problems.

If you look around this forum or Gentoo's portage forum, you can find many examples of these problems and how to solve them.

You may want to start with just updating individual packages to get the hang of how to use portage.

As for the blocked packages, Sabayon is a fairly comprehensive installation with a lot of packages, and this increases the likelihood that you'll run into issues with blockages as changes are made to the portage tree. But portage blocked packages crop up on just about any Gentoo/portage-based installation.

Sometimes, the issues with blocked packages can be addressed by removing the blocked package, and letting emerge resolve the dependencies without the package installed.

Other times, it might just be easier to remove the package that is introducing the blockage. For example. The package sci-misc/boinc is cited as one of your blockage issues. You may decide you don't need sci-misc/boinc, and just decide to remove it. Or you may decide to upgrade sci-misc/boinc to see if that resolves the issue.